/*
 * Copyright (c) 2023, NVIDIA CORPORATION.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.nvidia.spark.rapids

import org.scalatest.funsuite.AnyFunSuite
import org.scalatestplus.mockito.MockitoSugar.mock

import org.apache.spark.TaskContext

class ScalableTaskCompletionSuite extends AnyFunSuite {
  test("ScalableTaskCompletion prevents registering callbacks from a running callback") {
    val tc = mock[TaskContext]
    var doFail = true
    ScalableTaskCompletion.onTaskCompletion(tc, _ => {
      if (doFail) {
        ScalableTaskCompletion.onTaskCompletion(tc, _ => {
        })
      }
    })
    assertThrows[IllegalStateException] {
      ScalableTaskCompletion.reset()
    }
    doFail = false
    ScalableTaskCompletion.reset()
  }

  test("ScalableTaskCompletion prevents calling callbacks from a running callback") {
    val tc = mock[TaskContext]
    var doFail = true
    ScalableTaskCompletion.onTaskCompletion(tc, _ => {
      if (doFail) {
        ScalableTaskCompletion.reset()
      }
    })
    assertThrows[IllegalStateException] {
      ScalableTaskCompletion.reset()
    }
    doFail = false
    ScalableTaskCompletion.reset()
  }

  test("ScalableTaskCompletion succeeds in the good case") {
    val tc = mock[TaskContext]
    var called = false
    ScalableTaskCompletion.onTaskCompletion(tc, _ => {
      called = true
    })
    ScalableTaskCompletion.reset()
    assert(called)
  }
}
